885-section 11-6

6.     The guiding principles of the tax plan released by the Treasury Department could have even a greater significance for the economy than the particulars of the plan.

(A) even a greater significance for the economy than

(B) a significance that is even greater for the economy than

(C) even greater significance for the economy than have

(D) even greater significance for the economy than do

(E) a significance even greater for the economy than have

正确答案

我想问的是在比较级里面do也可以用来代替could吗?我叫不出这种语法的名称,不过不是一般的行为动词才能够被do替代吗?我觉得D应该是even greater significance for the economy than could

谢谢赐教~~